I am 37 year old and have a son of 5 years old and another of 10 month old. In both pregnancies doctor put me on thyroid tablet 25 mg. After first delivery my thyroid problem got cured itself and left taking thyroid tablet. But after my 2nd delivery, I still at thyroid tablet. As when I leave taking it, again thyroid level cross the limits. I am very tense. What should I do to permanent cure it and I may leave the tablet.